FG50T Member 568 Member For: 20y 2m 13d Gender: Male Location: Melbourne Posted 18/06/16 02:12 PM Share Posted 18/06/16 02:12 PM What holds the GT3576 back from holding 20psi all the way to redline? Is it the compressor wheel, the wastegate flapper or just the way FG's can be tuned? As far as I know mine hit's 17psi mid and tapers off to redline on my FG. Reason I ask is because I'm considering taking this turbo off my FG and putting it on my VL which will run 19-20psi but need to be able to hold it. Is there a way I can get the 3576 to do this (billet wheel or external gate)? I thought this would be a good place to ask since we're the only people with this turbo! Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 10y 5m 6d Gender: Male Location: Brisbane Posted 18/06/16 02:22 PM Share Posted 18/06/16 02:22 PM well engine capacity has an effect on boost you will see from a given turbo. It tapers off coz it cannot flow enough air(volume) to hold the pressure when the 4.0 is spinning at 5000+ rpm. It will definitely see 20psi or more on an rb30, not sure if it will hold it to 7000 od rpm, though it stands more of a chance with 1 less litre to feed. 1 Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 11y 11m 22d Gender: Male Location: Central Coast Posted 18/06/16 02:27 PM Share Posted 18/06/16 02:27 PM Comp wheel size mainly hold it back Would be a laugh turbo on the vl A gtx3076 would suit it better but would still work It's all about cfm My 3540 can hold 20 to the red line Unsure if it'll flow much more though 1 Link to comment Share on other sites More sharing options...
Lennox Member 2,586 Member For: 11y 2m Gender: Male Location: Perth Posted 18/06/16 03:05 PM Share Posted 18/06/16 03:05 PM Compressor size... remember it's a 4l engine 1 Link to comment Share on other sites More sharing options...
FG50T Member 568 Member For: 20y 2m 13d Gender: Male Location: Melbourne Posted 18/06/16 03:15 PM Author Share Posted 18/06/16 03:15 PM I understand..I didn't take into account the effect capacity would have on the efficiency. It just makes sense to me to recycle this turbo and buy a GTX for the FG. Don't want to bother getting it tuned up if it's not gonna work well though and don't want to have issues with more than 20psi through the bottom end so the 3576 seems like a perfect choice for efficiency on the 3L. Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 11y 11m 22d Gender: Male Location: Central Coast Posted 18/06/16 10:53 PM Share Posted 18/06/16 10:53 PM The turbine wheel and housing and a little to large for a 3I and with that comp wheel it's a little mismatched You can just upgrade your front cover, wheel and back plate to a gtx3582 or even bigger but then it depends what you want of your car Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 10y 5m 6d Gender: Male Location: Brisbane Posted 19/06/16 12:13 AM Share Posted 19/06/16 12:13 AM Matty people run MUCH larger turbos on rb30's lol. Albiet with antilag, big converters, shots of gas to get on the big converters etc. I think the gt3576 will be fine on the rb30. Wont be as responsive on as on the coon but remeber the rb will turn pretty hard rpm wise particularly if its built. Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 11y 11m 22d Gender: Male Location: Central Coast Posted 19/06/16 03:15 AM Share Posted 19/06/16 03:15 AM Of course it'll work It's a great turbo I just think it's mismatched for the rb Huge turbine and housing and small compressor wheel and cover Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 10y 5m 6d Gender: Male Location: Brisbane Posted 19/06/16 05:16 AM Share Posted 19/06/16 05:16 AM Correct but in this guys case its about recycling it. It will work. What turbo you looking at for the FG FG50T? 1 Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 11y 11m 22d Gender: Male Location: Central Coast Posted 19/06/16 05:22 AM Share Posted 19/06/16 05:22 AM Yup Will work well just better options imo Gtx4202? Link to comment Share on other sites More sharing options...
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